In tea, which insecticide does not cause resurgence of pink mite?

Correct option is B

Correct option – (b) Permethrin
Explanation
Permethrin does not cause resurgence of pink mite (Acaphylla theae) in tea plantations.
It shows relatively safer action with less disruption to natural enemies of mites.
Hence, permethrin is preferred where mite resurgence is a concern in tea ecosystems.
Information Booster / Facts
Pink mite resurgence is often linked to indiscriminate use of synthetic pyrethroids.
Preservation of natural predators is crucial in tea IPM programmes.
Why other options are incorrect
(a) Cypermethrin: Its broad-spectrum action suppresses natural enemies, leading to mite resurgence.
(c) Deltamethrin: Known to cause mite flare-ups due to predator elimination.
(d) Fenvalerate: Frequently associated with resurgence of pink mites in tea.
(e) Answer not known: The correct answer is well established through research.